Quote:
Originally Posted by White horse
What's of concern now is that the control box relays do not respond with the demist test.
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John,
Only the large relay (low speed) will respond to the demist test. Here's a way of testing the circuit:
Take off the control box lid. Place your voltmeter between the thin blue wire (on the large relay base) and earth. It should read battery voltage. Now start the engine and press the windscreen demist button. The meter reading should fall to 0v. That shows that the low speed relay is being energised by the ECM and the motor should then run. It probably won't, because one of the low speed brushes has worn out.
Simon